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Overview of Data Mining Methods (MS PPT)
Overview of Data Mining Methods (MS PPT)

... majors coming from a particular exclusive school who tend to get high grades ...
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CHAMELEON: A Hierarchical Clustering Algorithm Using Dynamic

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... choice between the use of external memory (disk) or distributed processing (multiple cores). Either approach also requires a clustering method that is inherently decomposable. Relatively few parallelizable clustering methods are known, most of which involve the partitioning of the data set, the inde ...
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NII International Internship Project

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Slide 1

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K-means clustering

k-means clustering is a method of vector quantization, originally from signal processing, that is popular for cluster analysis in data mining. k-means clustering aims to partition n observations into k clusters in which each observation belongs to the cluster with the nearest mean, serving as a prototype of the cluster. This results in a partitioning of the data space into Voronoi cells.The problem is computationally difficult (NP-hard); however, there are efficient heuristic algorithms that are commonly employed and converge quickly to a local optimum. These are usually similar to the expectation-maximization algorithm for mixtures of Gaussian distributions via an iterative refinement approach employed by both algorithms. Additionally, they both use cluster centers to model the data; however, k-means clustering tends to find clusters of comparable spatial extent, while the expectation-maximization mechanism allows clusters to have different shapes.The algorithm has a loose relationship to the k-nearest neighbor classifier, a popular machine learning technique for classification that is often confused with k-means because of the k in the name. One can apply the 1-nearest neighbor classifier on the cluster centers obtained by k-means to classify new data into the existing clusters. This is known as nearest centroid classifier or Rocchio algorithm.
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